#!/usr/bin/env python

from setuptools import find_packages, setup

import os
import subprocess
import time

version_file = "basicsr/version.py"


def readme():
    with open("README.md", encoding="utf-8") as f:
        content = f.read()
    return content


def get_git_hash():

    def _minimal_ext_cmd(cmd):
        # construct minimal environment
        env = {}
        for k in ["SYSTEMROOT", "PATH", "HOME"]:
            v = os.environ.get(k)
            if v is not None:
                env[k] = v
        # LANGUAGE is used on win32
        env["LANGUAGE"] = "C"
        env["LANG"] = "C"
        env["LC_ALL"] = "C"
        out = subprocess.Popen(cmd, stdout=subprocess.PIPE, env=env).communicate()[0]
        return out

    try:
        out = _minimal_ext_cmd(["git", "rev-parse", "HEAD"])
        sha = out.strip().decode("ascii")
    except OSError:
        sha = "unknown"

    return sha


def get_hash():
    if os.path.exists(".git"):
        sha = get_git_hash()[:7]
    # currently ignore this
    # elif os.path.exists(version_file):
    #     try:
    #         from basicsr.version import __version__
    #         sha = __version__.split('+')[-1]
    #     except ImportError:
    #         raise ImportError('Unable to get git version')
    else:
        sha = "unknown"

    return sha


def write_version_py():
    content = """# GENERATED VERSION FILE
# TIME: {}
__version__ = '{}'
__gitsha__ = '{}'
version_info = ({})
"""
    sha = get_hash()
    with open("VERSION", "r") as f:
        SHORT_VERSION = f.read().strip()
    VERSION_INFO = ", ".join([x if x.isdigit() else f'"{x}"' for x in SHORT_VERSION.split(".")])

    version_file_str = content.format(time.asctime(), SHORT_VERSION, sha, VERSION_INFO)
    with open(version_file, "w") as f:
        f.write(version_file_str)


def get_version():
    with open(version_file, "r") as f:
        exec(compile(f.read(), version_file, "exec"))
    return locals()["__version__"]


def make_cuda_ext(name, module, sources, sources_cuda=None):
    if sources_cuda is None:
        sources_cuda = []
    define_macros = []
    extra_compile_args = {"cxx": []}

    if torch.cuda.is_available() or os.getenv("FORCE_CUDA", "0") == "1":
        define_macros += [("WITH_CUDA", None)]
        extension = CUDAExtension
        extra_compile_args["nvcc"] = [
            "-D__CUDA_NO_HALF_OPERATORS__",
            "-D__CUDA_NO_HALF_CONVERSIONS__",
            "-D__CUDA_NO_HALF2_OPERATORS__",
        ]
        sources += sources_cuda
    else:
        print(f"Compiling {name} without CUDA")
        extension = CppExtension

    return extension(
        name=f"{module}.{name}",
        sources=[os.path.join(*module.split("."), p) for p in sources],
        define_macros=define_macros,
        extra_compile_args=extra_compile_args,
    )


def get_requirements(filename="requirements.txt"):
    here = os.path.dirname(os.path.realpath(__file__))
    with open(os.path.join(here, filename), "r") as f:
        requires = [line.replace("\n", "") for line in f.readlines()]
    return requires


if __name__ == "__main__":
    cuda_ext = os.getenv("BASICSR_EXT")  # whether compile cuda ext
    if cuda_ext == "True":
        try:
            import torch
            from torch.utils.cpp_extension import BuildExtension, CppExtension, CUDAExtension
        except ImportError:
            raise ImportError("Unable to import torch - torch is needed to build cuda extensions")

        ext_modules = [
            make_cuda_ext(
                name="deform_conv_ext",
                module="basicsr.ops.dcn",
                sources=["src/deform_conv_ext.cpp"],
                sources_cuda=["src/deform_conv_cuda.cpp", "src/deform_conv_cuda_kernel.cu"],
            ),
            make_cuda_ext(
                name="fused_act_ext", module="basicsr.ops.fused_act", sources=["src/fused_bias_act.cpp"], sources_cuda=["src/fused_bias_act_kernel.cu"]
            ),
            make_cuda_ext(name="upfirdn2d_ext", module="basicsr.ops.upfirdn2d", sources=["src/upfirdn2d.cpp"], sources_cuda=["src/upfirdn2d_kernel.cu"]),
        ]
        setup_kwargs = dict(cmdclass={"build_ext": BuildExtension})
    else:
        ext_modules = []
        setup_kwargs = dict()

    write_version_py()
    setup(
        name="basicsr",
        version=get_version(),
        description="Open Source Image and Video Super-Resolution Toolbox",
        long_description=readme(),
        long_description_content_type="text/markdown",
        author="Xintao Wang",
        author_email="xintao.wang@outlook.com",
        keywords="computer vision, restoration, super resolution",
        url="https://github.com/xinntao/BasicSR",
        include_package_data=True,
        packages=find_packages(exclude=("options", "datasets", "experiments", "results", "tb_logger", "wandb")),
        classifiers=[
            "Development Status :: 4 - Beta",
            "License :: OSI Approved :: Apache Software License",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.7",
            "Programming Language :: Python :: 3.8",
        ],
        license="Apache License 2.0",
        setup_requires=["cython", "numpy", "torch"],
        install_requires=get_requirements(),
        ext_modules=ext_modules,
        zip_safe=False,
        **setup_kwargs,
    )
